The efficiency of enhanced biological phosphorus removal from real wastewater affected by different ratios of acetic to propionic acid

Chen, Yinguang; Randall, Andrew A.; McCue, Terrence

doi:10.1016/j.watres.2003.08.025

Cited by 215 publications

(102 citation statements)

References 18 publications

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“…Recent studies have suggested that a propionate feed source is more beneficial for reliable EBPR performance than acetate (Chen et al, 2004;Oehmen et al, 2005aOehmen et al, , 2006Pijuan et al, 2004;Thomas et al, 2003), likely due to a reduced level of GAO activity. The metabolic activity of PAOs and GAOs fed with different carbon sources is compared in Further investigation is required to assess the proliferation of these Alphaproteobacteria GAOs in EBPR plants as well as their ability to compete with PAOs in these systems.…”

Section: Impact On the Competition Between Paos And Gaosmentioning

confidence: 99%

Anaerobic and aerobic metabolism of glycogen-accumulating organisms selected with propionate as the sole carbon source

et al. 2006

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In the microbial competition observed in enhanced biological phosphorus removal (EBPR) systems, an undesirable group of micro-organisms known as glycogen-accumulating organisms (GAOs) compete for carbon in the anaerobic period with the desired polyphosphate-accumulating organisms (PAOs). Some studies have suggested that a propionate carbon source provides PAOs with a competitive advantage over GAOs in EBPR systems; however, the metabolism of GAOs with this carbon source has not been previously investigated. In this study, GAOs were enriched in a laboratory-scale bioreactor with propionate as the sole carbon source, in an effort to better understand their biochemical processes. Based on comprehensive solid-, liquid-and gas-phase chemical analytical data from the bioreactor, a metabolic model was proposed for the metabolism of propionate by GAOs. The model adequately described the anaerobic stoichiometry observed through chemical analysis, and can be a valuable tool for further investigation of the competition between PAOs and GAOs, and for the optimization of the EBPR process. A group of Alphaproteobacteria dominated the biomass (96 % of Bacteria) from this bioreactor, while postfluorescence in situ hybridization (FISH) chemical staining confirmed that these Alphaproteobacteria produced poly-b-hydroxyalkanoates (PHAs) anaerobically and utilized them aerobically, demonstrating that they were putative GAOs. Some of the Alphaproteobacteria were related to Defluvicoccus vanus (16 % of Bacteria), but the specific identity of many could not be determined by FISH. Further investigation into the identity of other GAOs is necessary.

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Section: Impact On the Competition Between Paos And Gaosmentioning

confidence: 99%

Anaerobic and aerobic metabolism of glycogen-accumulating organisms selected with propionate as the sole carbon source

et al. 2006

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“…2). While the accumulation of PHB and polyP has been reported to be cyclical, i.e., with PHB synthesis occurring in the anaerobic phase of growth and polyP synthesis occurring in an aerobic phase (6,15,28), it appears that the accumulation of polyP and mclPHA by P. putida CA-3 occurs concurrently for 19 h ( Fig. 1 and 2).…”

mentioning

confidence: 94%

“…PHA containing monomers with six or more carbons is termed medium-chain-length PHA. A link between polyP and PHB accumulation has been widely reported in studies of phosphate removal from wastewater by enhanced biological phosphorus removal, where microbial sludges are exposed to alternating anaerobic/aerobic cycles (6,28,15). PHB accumulated in the anaerobic cycle is subsequently degraded in the aerobic cycle to provide energy for phosphate uptake and polyP biosynthesis.…”

mentioning

confidence: 96%

Polyphosphate Accumulation by Pseudomonas putida CA-3 and Other Medium-Chain-Length Polyhydroxyalkanoate-Accumulating Bacteria under Aerobic Growth Conditions

Tobin

McGrath²,

Mullan³

et al. 2007

Appl Environ Microbiol

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“…Synthetic wastewater used throughout these investigations, unless otherwise described, was the same and prepared daily. Acetate was used for the sole carbon source since it was the most common volatile fatty acids present in real domestic wastewaters 29 . KH 2 PO 4 was selected as the phosphorus source.…”

Section: Methodsmentioning

confidence: 99%

Characterization of Pure Cultures Isolated from Sulfamethoxazole-acclimated Activated Sludge with Respect to Taxonomic Identification and Sulfamethoxazole Biodegradation Potential

2016

Environmental Engineering and Activated Sludge Processes

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Free nitrous acid (FNA), which is the protonated form of nitrite and inevitably produced during biological nitrogen removal, has been demonstrated to strongly inhibit the activity of polyphosphate accumulating organisms (PAOs). Herein we reported an efficient process for wastewater treatment, i.e., the oxic/anoxic/ oxic/extended-idle process to mitigate the generation of FNA and its inhibition on PAOs. The results showed that this new process enriched more PAOs which thereby achieved higher phosphorus removal efficiency than the conventional four-step (i.e., anaerobic/oxic/anoxic/oxic) biological nutrient removal process (41 6 7% versus 30 6 5% in abundance of PAOs and 97 6 0.73% versus 82 6 1.2% in efficiency of phosphorus removal). It was found that this new process increased pH value but decreased nitrite accumulation, resulting in the decreased FNA generation. Further experiments showed that the new process could alleviate the inhibition of FNA on the metabolisms of PAOs even under the same FNA concentration.

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The efficiency of enhanced biological phosphorus removal from real wastewater affected by different ratios of acetic to propionic acid

Cited by 215 publications

References 18 publications

Anaerobic and aerobic metabolism of glycogen-accumulating organisms selected with propionate as the sole carbon source

Anaerobic and aerobic metabolism of glycogen-accumulating organisms selected with propionate as the sole carbon source

Polyphosphate Accumulation by Pseudomonas putida CA-3 and Other Medium-Chain-Length Polyhydroxyalkanoate-Accumulating Bacteria under Aerobic Growth Conditions

Characterization of Pure Cultures Isolated from Sulfamethoxazole-acclimated Activated Sludge with Respect to Taxonomic Identification and Sulfamethoxazole Biodegradation Potential

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